Power company says it will shut all of its existing coal-fired power plants to curb greenhouse gas emissions

SYDNEY—One of Australia’s biggest electricity generators said Friday it will shut all of its existing coal-fired power plants by 2050 to curb greenhouse gas emissions, adding to a global slide in the fossil fuel’s popularity.

AGL Energy Ltd., the country’s biggest energy retailer behind Origin Energy Ltd., said it would never again build or acquire any coal-fired power plants—unless they come equipped with a carbon capture and storage facility.